Worksheet 915 · Skill 5

Set and drift

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1. At 1330 your fix is 070°T, 2.6 nm from Gannet Rock daybeacon. You steer 008°T at 5.3 kn through the water. At 1410 a new fix puts you 059°T, 4.7 nm from Tern Island tower.

   Plot the 1410 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1340 your fix is 007°T, 3.0 nm from Mill stack. You steer 289°T at 4.5 kn through the water. At 1410 a new fix puts you 235°T, 3.4 nm from Tern Island tower.

   Plot the 1410 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0740 your fix is 091°T, 2.2 nm from Heron Point Light. You steer 080°T at 7.7 kn through the water. At 0810 a new fix puts you 204°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 0810 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1530 your fix is 032°T, 2.4 nm from Heron Point Light. You steer 111°T at 5.1 kn through the water. At 1615 a new fix puts you 018°T, 2.4 nm from Mill stack.

   Plot the 1615 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1125 your fix is 051°T, 4.1 nm from Westfield church spire. You steer 213°T at 4.4 kn through the water. At 1220 a new fix puts you 085°T, 3.0 nm from Westfield church spire.

   Plot the 1220 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1040 your fix is 259°T, 1.8 nm from Gannet Rock daybeacon. You steer 063°T at 7.4 kn through the water. At 1125 a new fix puts you 029°T, 3.5 nm from Gannet Rock daybeacon.

   Plot the 1125 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1435 your fix is 331°T, 1.8 nm from Tern Island tower. You steer 230°T at 7.4 kn through the water. At 1515 a new fix puts you 251°T, 3.3 nm from Tern Island tower.

   Plot the 1515 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1150 your fix is 253°T, 3.2 nm from Tern Island tower. You steer 188°T at 4.5 kn through the water. At 1230 a new fix puts you 080°T, 1.5 nm from Heron Point Light.

   Plot the 1230 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn